Stud removal and tapping kit

ABSTRACT

The invention comprises a tool kit for engines having an alignment block adapted to fit over a pair of socketed press-in type rocker arm stud for acting as a guide in removing one of the press-in type studs, an alignment pin for aligning the block with the remaining stud, so that the block may accurately receive a tap for threading the bore of the removed press-in type stud so as to receive a threaded type stud.

United States Patent Haselmo 1 1 Nov. 6, 1973 541 STUD REMOVAL AND TAPPING KIT 3,605,242 9/1971 Kufi'ner 29/263 3,550,173 12/1970 Gawlik.... 10/140 [76] lnvemor- 3" 315 F 3,589,825 6/1971 Wojcik 408/72 Lompoc, Calif. 93436 Filedi 1971 Primary Examiner-Charles W. Lanham Assistant ExaminerE. M. Combs 21 A 1. No.: 119 203 l 1 pp Attorney-Robert E. Kleve [52] US. Cl 10/1 R, 29/200 D, 29/271 51 Int. c1..... B23g 1/48, 823p 19/02, B25b 27/14 1 ABSTRACT [58] Fleld of Search 10/1 R, l A, 1 B; The invention comprises a tool kit for engines having an alignment block adapted to fit over a pair of socketed press-in type rocker arm stud for acting as a guide in removing one of the press-in type studs, an alignment pin for aligning the block with the remaining stud, so that the block may accurately receive a tap for threading the bore of the removed press-in type stud so as to receive a threaded type stud.

1 Claim, 5 Drawing Figures ,5? V I 38 4 22 s 24 2s v I 2 PAIENTEnmv 6 1973 3.769648 INVENTOR ROBERT D. 'HASELMO I films 142mg ATTORNEY This invention relates to tools, more particularly, the invention relates to tools and tool kits for engines.

It is an object of the invention to provide a novel tool kit for removing press-in type rocker arm studs from their bores and threading the sockets or bores to accomodate a threaded type stud.

It is another object of the invention to provide a novel tool kit for removing a press-in type rocker arm stud from an engine head and threading the bores of the stud for threaded type studs, which can be easily and rapidly operated.

Further objects and advantages of the invention will become apparent as the description proceeds and when taken in conjunction with the accompanying draing wherein:

FIG. 1 is a perspective view of the alignment block of the tool kit invention and shown mounted onto a pair of press-in type rocker arm studs.

FIG. 2 is a side elevational view of the alignment block of the tool kit invention shown mounted onto a pair of press-in type rocker arm studs with the nut threaded into one of the studs for'turning to remove the one pressin type studs.

FIG. 3 is a side elevational view of the alignment block after the press-in type rocker arm stud has been removed and the alignment pin has been inserted to align the block for tapping.

FIG. 4 is a side elevational view of the alignment block retained by the removed stud and after alignment by the alignment pin with the tap shown in position to be turned in for tapping the socket of the mounting boss of the removed press in stud.

FIG. 5 is a plan view of the alignment block.

Briefly stated, the invention comprises a tool kit for removing a press-in type rocker arm stud and threading the socket of the removed press-in type stud for receiving a threaded type stud. The tool kit has an alignment block with the block having a pair of holes for receiving a pair of socketed press-in type rocker arm studs mounted on an engine head. A nut is provided for turning onto the stud to tighten down on the block with the nut being continued to be tightened or turned until the press-in type stud is removed. The nut thereafter is attached to the remaining stud on alignment pin is provided for insertion into the hole of the block from which the press-in stud was removed into the socket of the mounting boss therebeneath to align the socket and bore of the block and thereafter the nut is tightened to block the block in alignment. A tap is provided for insertion into the aligned hole to tap the socket with the aligned hole serving as a guideway for the tap while tapping or threading the socket.

Referring more particularly to the drawing in FIGS. 1 and 2, the alignment block 21 of the tool kit invention is shown mounted over a pair of press-in type rocker arm studs 22 and 23. The press-in type rocker arm studs 22 and 23 have their lower smooth cylindrical ends 22 and 23 socketed in smooth cylindrical bores 24 and 25 of the mounting bosses 26 and 27 of the engine head 28. The tool kit also has a threaded nut 30, an alignment pin or post 31 and a tap 32 which are shown in FIGS. 2-4.

The alignment block 21 has a pair of vertical bores 33 and 34 which are aligned in spaced parallel relation to one another.

OPERATION The tool kit invention operates as follows: when it is desired to remove a press-in type rocker arm stud from an engine head and replace it with a threaded type rocker arm stud, as assuming for purposes of illustration that the press in rocker or stud is the one which the operator wished to replace. The operator will first place the alignment block 21 over the press-in studs 22 and 23, as shown in FIG. 1, with the bore 33 receiving stud 22 and the bore 34 receiving stud 23, and with the block resting on the tap surfaces of the mounting bosses 26, and 27, as shown in more detail in FIG. 2. The bore 33 of the block is only slightly larger than the stud 22, so as to be a snug fit to align the block in perpendicular relation. The bore 34 is larger than bore 33.

Once the block 21 has been attached over the studs 22 and 23, the nut will be threaded onto the stud 23 as shown in FIG. 2. The nut 30 will be tightened down against the tap surface 35 of the block and the operator will continue to tighten the nut down against the top of the block to draw the press-in stud 23 upwardly out of the bore 25 of the mounting boss 27. The nut 30 will continue to be tightened until the stud 23 is pulled free of the bore 25 and the stud may be removed from the block.

Also, a washer 37 may be inserted over the stud 23 between the nut 30 and the block for the tightening operation so that the stud may be removed from the bore 25 and block.

Thereafter the nut 30 will be unthreaded from the stud 23 and threaded onto stud 22.

Before the nut 30 is tightened down on stud 22 against the block 21, the algnment pin 31 will be employed to align the block to serve as a guideway from the tap. The alignment pin 31 has a smaller cylindrical end portion 38 and a corresponding larger cylindrical portion 39 and a larger upper handle portion 40 with the cylindrical portions 38, 39, and 40 aligned in coaxial relation to one another.

The smaller cylindrical portion 38 corresponds in depth to the bore 25 and has an outside diameter only slightly smaller than the inside diameter of bore 25 so as to be a relatively snug fit. The intermediate portion 39 has a length which corresponds to the depth of the bore 34 and has an outside diameter only slightly smaller than the bore 34 so as to be a relatively snug fit. The upper cylindrical surface 40 is larger than the bore iii so that when the alignment pin has been inserted into the socket 25 and bore 34 as shown in FIG. 3, lower edge 40' of the alignment pin will sit upon the upper surface of the block 21.

Thus, once the nut 30 has been attached to stud 22 and nut tightened the alignment pin or post will be inserted into the bore 34 and socket 25 with the smaller portion 38 being received in socket 25 and the intermediate portion 39 received in bore 34 as shown in FIG.

3, to thereby align the socket 25 and bore 34 in coaxial relation to one another.

Once socket 25 and bore 34 have been aligned in coaxial relation, the nut 30 will be tightened down against the tap surface 35 of the block on stud 22. to lock the block in aligned position with socket 25 and bore 34 in coaxial relation.

Thereafter a tap 32 which has an outside diameter of a size only slightly smaller than bore 34 and of a size for threading socket 25 will be inserted into bore 34. The

upper end 32' of the tap is square and may be received in the corresponding square socket 39 of the post 31 as shown in FIG. 5, and the alignment post or pin will be rotated about a horizontal plane about the vertical 1ongitudinal axis of the tap 32 to rotate the tap 32 to cause the tap 32 to thread the socket 25 with the bore 34 acting as guideway for the tap to maintain the tap in alignment with the bore.

Once the bore or socket 25 has been threaded the tap and block may be removed and a threaded type rocker or stud may be threaded into the bore 25.

Thus, it will be seen that a novel tool kit has been provided for easily and rapidly and accurately removing a press-in type rocker arm stud from its socket on engine head and threading the bore for a threaded type rocker arm stud.

The bore 33 will be counter sunk as shown in FIG. 2 and designated by numeral 33' so that when the alignment block is receiving a threaded type stud or bore 33, the counter sunk portion 33' on the bottom will receive and accomodate the conventional enlargement of the threaded type stud which projects slightly above the mounting boss.

It will be obvious that various changes and departures may be made to the invention'without departing from the spirit thereof and accordingly it is not intended that the invention be limited to that specifically described in the specification or as illustrated in the drawing but only as set forth in the appended claims wherein:

What Is claimed ls:

1. An engine tool device comprising an alignment block having a pair of spaced, substantially smooth cylindrical bores extending therethrough with one of said bores adapted to be fitted over one and the other bore adapted to be fitted over the other of a pair of press-in type rocker arm studs, which studs are fitted in bores of mounting bosses of an engine head, a nut means for threading onto one of said press-in type studs for threading down against theblock to withdraw the one press-in type stud out of its mounting bore, a cylindrical alignment pin for aligning the one bore of the block with the mounting bore of the removed stud, said one bore of said block being larger than said other bore of said block for slideably receiving a tap and for withdrawing said stud through said one bore, said other bore of said block, which is fitted over said other press-in type stud, being only slightly larger than said other press-in type stud, said pin having a reduced cylindrical portion at its lowermost end to fit into the mounting bore of the removed press-in type stud and an enlarged cylindrical portion on said pin located coaxially above the reduced cylindrical portion and adapted to fit into the one bore of the block to align the one bore of the block coaxially with the mounting bore of the press-in type stud, said pin having an outwardly extending flat surface at the upper end of the reduced cylindrical portion extending outwardly from the reduced cylindrical portion of the pin to rest on an upper surface of the mounting boss, said nut means being threadable onto said other of the press-in type studs to lock the block in position after being aligned coaxially by said alignment pin whereby the alignment pin may be removed and the tap may be inserted into the one bore and tapped into the one mounting bore of the removed press-in type stud to thread the mounting bore to receive a threadable type stud, with said one bore of said block serving as a guideway for the tap. 

1. An engine tool device comprising an alignment block having a pair of spaced, substantially smooth cylindrical bores extending therethrough with one of said bores adapted to be fitted over one and the other bore adapted to be fitted over the other of a pair of press-in type rocker arm studs, which studs are fitted in bores of mounting bosses of an engine head, a nut means for threading onto one of said press-in type studs for threading down against the block to withdraw the one press-in type stud out of its mounting bore, a cylindrical alignment pin for aligning the one bore of the block with the mounting bore of the removed stud, said one bore of said block being larger than said other bore of said block for slideably receiving a tap and for withdrawing said stud through said one bore, said other bore of said block, which is fitted over said other press-in type stud, being only slightly larger than said other press-in type stud, said pin having a reduced cylindrical portion at its lowermost end to fit into the mounting bore of the removed press-in type stud and an enlarged cylindrical portion on said pin located coaxially above the reduced cylindrical portion and adapted to fit into the one bore of the block to align the one bore of the block coaxially with the mounting bore of the press-in type stud, said pin having an outwardly extending flat surface at the upper end of the reduced cylindrical portion extending outwardly from the reduced cylindrical portion of the pin to rest on an upper surface of the mounting boss, said nut means being threadable onto said other of the press-in type studs to lock the block in position after being aligned coaxially by said alignment pin whereby the alignment pin may be removed and the tap may be inserted into the one bore and tapped into the one mounting bore of the removed press-in type stud to thread the mounting bore to receive a threadable type stud, with said one bore of said block serving as a guideway for the tap. 